Air compressor



Aug. 5 1924.

J. W. LAWHEAD s-Sheet 1 Filed Nov. 20, 1922 1 MIC/H l'o L JAME5WLAwHEAn.

J. W. LAWHEAD AIR COMPRESSOR Filed Nov. 20, 1922 4 Sheets-Sheet 2 Illllllnll'l Ill.

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A123. 5 192.4. 1,503,540 J. w. LAWHEAD AIR COMPRESSOR Filed New. 20,1922 4 Sheets$heet 5 Fig.5.

JAMES Wl AWHEAIJ.

Aug. 5 1924. v

- J. W; LAWHEAD AIR COMPRESSOR 4 Sheets-Sheet 4 Filed Nov. 20 1922 SnowH01, JAMES WLAWHEAU,

Patented Aug. 5, 1924.

JAMES W. LAWHEAD, 0F WILMINGTON, OHIO, ASSIGNOB T0 AU-TO COMPRESSOR.COMPANY, OF WILMINGTON, OHIO, A CORPORATION OF Ol IIQ.

AIR COMPRESSOR.

- Application filed November 20, 1922. Serial No. 602,041.

To all who-m it may concern:

Be it known that 1, JAMES TV. LAW'HEADZ a citizen of the United States,residing at. Wilmington, in the county of Clinton and State of Ohio,have invented certain new vide the advantages of a rotary drivingelement whose axis of rotation is maintained substantially at rightangles to the axial line of the reciprocating piston. 1 V

It is my object to provide means to interconnect a piston of thischaracter and such a rotary driving member which will accom plishtworesults, to wit, the function of conveying to the pistona right linemotionand the function of preventing the piston from rotary motion onits own axis.

It is my object'to provide a driving mech anism which will develop alarge proportion of thehorse power; applied to it, will not readily wearand will positively and rapidly impart reciprocatory movement from arotary body. I r P V It is my object to provide such other coordinateobjectswhich may be found necessary of accomplishment in an'aircompressor. Referring to the drawings Figure 1 is a perspective of mycomplete outfit embodying myinvention;

Fig. 2 isa section on the line 22 of Fig. 1; .7 s

Fig. 3 is a section on the line 33 of Fig. 2; L a

Fig. 4'is a section through the primary and secondary cylinders andpistons showing the valve arrangement;

ig. 5 is a section through the introductory and exit chambers.

Referring to the drawings in detail: 7

1 is a tank supported upon'the rings 2. Upon the tank is mounted a baseplate 3 on the side members 4. This base platecarries the power'unit 5,the regulator '6 and the compressor support This compressor support 7supports the main driving shaft 8. and the power wheel or driving wheel9 which is mounted thereon. 7

At the other end of 8 opposite the end on which the driving wheel 9 islocated is the cam lO. '10 is mounted on 8 and retained thereon by akey11 working in the keyway 12, in'the shaft 8, and in the keyway 13 in thecam wheel 10. The cam rings 14 and 15 form'a channel-way there'betweendesignat ed 16 forming a guide-way or track. These two cam ringsareconcentric with one another. The shaft8 is located near the rim of theinner ring 14. Both rings are eccentrically located with respect to theshaft 8 which is centrally located of the cam wheel and the first andthe outer ring 13 merges at one point in its lengthwith the peripheryandthe cam wheel 10.-

Located between these cam walls 14 and 15-and adapted to traveleocentrically of the shaft 8 as well asturn about its own axis is thecam anti-friction roller 17 which is rotated about its own axis as 10rotates and is also bodily reciprocated along the line designated a''a adistance limited by the di- 'mensions of the several parts as will beseen indicated by the guide-way 18 formed in the housing. 18 servesasthe giude-way for a guide-block- 19 which'carries with it thenonrotating piston rod 20 which reciprocates backandforth on :the'lineaia with the bodily movement'of 17. 17 rotates "freely upon the piston.rod 20. This rod 20 projects through the guide-block 19 and into thecylinder casing 21 where it is oined by the set screw 22 to thepistonframefi23.

This framecarriesa piston head 24i-iwhich works in the primarycompression chamber 125. Italso carries a piston head 26 work ingflinthe secondary or high compression chamber 27. Each of these chambers isprovided' with radiating fins to radiate the heat therefrom.

In operation, the air is drawn from the chamber 29 through the pipe 30,the in-take passageway 31 beneath the valve 32 against theresistance ofthe valve spring 33 into the primary or low compression cylinder 25.

Upon being compressed the air makes its exit by depressingthe exit valve34 against the resistance of the spring 35; and makes its exit throughthe heat radiating passage way 36, through 37 to the iii-take passageway38 adjacent the high compression cyl- Hider-27. It makes its entranceinto the cylinder by elevating the valve 39 against the spring 40. Uponbeing compressed to a predetermined degree which depresses the exitvalve 41 against the resistance of the spring 42. It then makes itsescape through the passageway 43 and the pipe 44: to the chamber 45,whence it passes through the pipe 46 to the tank 1.

The casing 21 is provided with a removable cap 47 to permit ofinspection in oiling.

It will also be seen that the inclosing casing 48 will permit of oilbeing placed in the bottom thereof to keep the cam Wheel lubricated aswell as the cam rings.

It will be understood that I desire to com prehend Within my inventionthe suitable and necessary modifications which may be found necessary inadapting it to varying types of machinery. It will be further understoodthat I prefer to use it in connection with an air compressor, but do notdesire to limit myself to such an adaption of it.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent, is z i l. The combination with a cylindercasing having a slot in one side wall, the edges of said slotconstituting guides for a guide block, of a guide block mounted in saidguides to reciprocate longitudinally of said casing, a housing portionadjacent the easing and having an oil sump therein, a pistonreciprocably mounted in said casing, a pin secured to said piston andpassing through the guide block to project therefrom, and a rotating cammounted in said housing and extending into said sump and having a groovewherein said pin engages.

2. The combination with a housing having an opening in a wall thereofand an oil sump therein, a cylinder casing having a portion thereofclosing the opening in said housing and a slot in said portion, theedges of said slot constituting guides for a guide block, of a guideblock mounted in said guides to reciprocate longitudinally of saidcasing, a piston reciprocably mounted in said casing, a pin secured tosaid piston and passing through the guide block, to project therefrominto said housing, a rotating cam mounted on said housing and extendinginto said sump and having a groove wherein said pin engages, alinedcylinders at the opposite ends of said casing, heads on said pistonfitting respective cylinders, and means for rotating said cam.

8. The combination with a cylinder casing having a slot in one side anda centrally disposed opening in its top, the edges of said slotconstituting guides, a removable closure for said opening, of a guideblock mounted in said guides to reciprocate longitudinally of saidcasing, a hollow pis ton reciprocably mounted in said casing andprovided with a transversely extending pin.

bearing having a threaded set screw bore movable into and out ofalinement with the casing opening, a pin having one end mounted in saidbearing and extending through said guide block to project therebeyond, aset screw in said bore engaging said pin, a cam roller on the projectingend of said pin, and a rotating'cam engaging said cam roller.

4. The combination with a cylinder cas-g ing having a slot in one sideand a centrally disposed opening in its top, the edges of said slotconstituting guides, a removable closure for said opening, of a guideblock mounted in said guides to reciprocate longi tudinally of saidcasing, a hollow piston reciprocably mounted in said casing and providedwith a transversely extending pin bearing having a threaded set screwbore movable into and out of alinement with the casing opening, a pinhaving oneiend mounted in said bearing and extending through said guideblock to project therebeyond, a set screw in said bore engaging saidpin, a cam roller on the projecting end JAMES W. LAWHEAD.

